Outer Diameter:25mm Inner Diameter:13mm Wall Thickness:6mm High efficient production line We are a manufacturer of rubber products and plastic products, with well-equipped testing equipment and strong technical force. With a wide range, good quality, reasonable prices and stylish designs, our products are extensively used in fishery and other industries. Fresh air through roots blower, airway pressure uniform expansion and achieve aerator, large fine bubbles in design value (diameter from 20 ~ 50UM), rise in the extremely slow, dissolved oxygen has obvious effect, thus greatly improve the oxygen in water, increases the breeding density. Apply pressure range wide: 5 ~ 80kpa Applicable water deep:0-6meters.